WO2010090155A1

WO2010090155A1 - Parking brake device

Info

Publication number: WO2010090155A1
Application number: PCT/JP2010/051344
Authority: WO
Inventors: 喬哉安積; 直人澁井; 覚増田
Original assignee: 本田技研工業株式会社; 大塚工機株式会社
Priority date: 2009-02-06
Filing date: 2010-02-01
Publication date: 2010-08-12
Also published as: EP2394872A1; EP2394872B1; US20110290064A1; JPWO2010090155A1; JP5398747B2; US8578813B2; EP2394872A4

Abstract

On the engaging tooth (17a) of a ratchet plate (17) of a parking brake device, there are a first region (S1) wherein the pawl (19c) of a ratchet pole (19) makes contact and is stopped in a balanced state when the parking break is loosened after being pulled up while a release rod is pushed, and a second region (S2) wherein the pawl is stopped in a half-engaged state near the tip of the tooth when the release rod pushing force is removed. Because the load line of force (F1) is thereby maintained by the release rod pressing force when the pawl (19c) makes contact closer to the tip of the engaging tooth (17a) than the first region (S1), the pawl (19c) sliding over the engaging tooth (17a) and becoming half-engaged near the tooth tip is prevented without becoming half-engaged near the tip of the tooth in the second region (S2). The occurrence of a half-engaged state near the tip of the tooth of the ratchet mechanism can be reliably prevented even when a rider mistakenly pulls up the parking break lever to the actuated position while pushing the release rod.

Description

Parking brake device

The present invention includes a parking brake lever pivotally supported by a vehicle body and lifted to pull a brake cable, a ratchet pole pivotally supported by the parking brake lever via a fulcrum pin, and the ratchet pole A ratchet plate that is alternately provided with a plurality of locking teeth and a locking groove that can be engaged with the locking claw and fixed to the vehicle body, and the ratchet pawl is pressed by an occupant's release operation, thereby The present invention relates to a parking brake device including a release rod that swings the ratchet pole in a direction of releasing the engagement from the locking groove.

Such a parking brake device is known from Patent Document 1 below.
Japanese Unexamined Patent Publication No. 2007-161183

By the way, in this type of parking brake device, when the occupant raises the parking brake lever to the operating position without pressing the release rod, the parking brake lever is automatically held in the operating position by the ratchet mechanism, and the release rod is released from this state. When the ratchet mechanism is released by pushing, the parking brake lever is automatically pulled down to the inoperative position by the tension of the brake cable.

However, when the occupant raises the parking brake lever toward the operating position, the occupant may pull up while pushing the release rod slightly. In this case, when the occupant lifts the parking brake lever to the operating position and removes the force, the latching pawls of the ratchet pole and the latching teeth of the ratchet plate are not completely engaged, and their tip portions are engaged with each other. The parking brake lever may stop in a state (half hook contact state). This is a phenomenon that occurs only when the tooth tips of the ratchet pole and the ratchet plate come into contact with each other. ing.

The present invention has been made in view of the above circumstances, and even when the occupant pulls the parking brake lever toward the operating position while pushing the release rod, a half-hanging state per tooth tip of the ratchet mechanism occurs. The object is to prevent it reliably and to completely fit the ratchet pole and the ratchet plate.

In order to achieve the above object, according to the present invention, a parking brake lever pivotally supported by a vehicle body and lifted up to pull a brake cable, and a pivotally supported via a fulcrum pin on the parking brake lever. The ratchet pole, a ratchet plate that is fixed to the vehicle body with a plurality of locking teeth and a locking groove that can be engaged with the latching pawl of the ratchet pole, and the ratchet pole that is released by the occupant's release operation. In a parking brake device comprising a release rod that swings the ratchet pole in a direction to release the engagement of the locking claw from the locking groove by pressing, a predetermined distance is provided between the ratchet pole and the fulcrum pin. A clearance is provided, and the ratchet is in a state where the teeth of the locking teeth and the locking claws are in contact with each other The locking tooth with respect to the direction of the first straight line when the contact point of the top pole and the release rod, the center of the arc of the locking tooth, and the center of the arc of the locking claw are in a straight line In addition, the contact points of the fulcrum pin and the ratchet pole, the center of the arc of the locking tooth, and the center of the arc of the locking claw are straightened in a state where the tooth tips of the locking claw are in contact with each other. There is proposed a parking brake device having a first feature that the direction of the second straight line when present on a line is different and the ratchet pole is movable relative to the release rod.

According to the invention, in addition to the first feature, when the lifting force of the occupant of the parking brake lever and the tension of the brake cable are substantially equal, the push of the release rod against the ratchet pole is performed. When the locking teeth and the tooth tips of the locking claws come into contact with each other due to pressure and the first straight line exists in this state, the first balancing state is established, and the pulling force of the occupant of the parking brake lever Is substantially zero, the teeth of the locking teeth and the locking claws are brought into contact with each other by the tension of the brake cable, and when the second straight line exists in this state, the second balanced state The first balanced state and the second balanced state are the balanced state when the first straight line exists and the balanced state when the second straight line exists. Each of the generated locking teeth and the locking claw is generated in a predetermined area centered on the contact point, and the first balanced state is generated and the second balanced state is A parking brake device is proposed which has a second feature that it does not overlap with the generated region.

Note that the bracket 11 of the embodiment corresponds to the vehicle body of the present invention.

According to the first feature of the present invention, when the occupant pulls up the parking brake lever, the latching pawl of the ratchet pole moves while slipping the latching teeth and the latching groove of the ratchet plate, and the parking brake lever is moved to the operating position. When the occupant releases the lifting force of the parking brake lever, the locking claw engages with one of the locking grooves, and the parking brake lever is held in the operating position. When the occupant pushes the release rod from this state, the ratchet pole is swung by the release rod to disengage the locking claw and the locking groove, and the parking brake lever is pulled down to the non-operating position by the tension of the brake cable. .

Pull the parking brake lever while pushing the release rod to apply the disengagement force to the ratchet pole, and then release the finger from the push button while the pulling force of the parking brake lever by the occupant is approximately balanced with the tension of the brake cable When the contact point (b), the arc center (O1) of the locking tooth and the arc center (O2) of the locking claw are in a straight line, the locking claw of the ratchet pole is If it comes in contact with the position closer to the tip of the locking tooth than the position where it contacts the locking tooth (on the first region of the embodiment), the parking brake lever pulling force is released from that state and the parking brake is released. As the lever is pulled down, the release rod and fulcrum pin also move down, but the force in the direction in which the fulcrum pin is lowered continues until the fulcrum pin moves by the clearance. Not transmitted to the ratchet pole, force the release rod is lowered is transmitted to the pawl. This force is transmitted to the ratchet plate via the ratchet pole, but the reaction force from the ratchet plate to the ratchet pole is divided because the latching claw is in contact with the position closer to the tip of the latching tooth, A force in the direction in which the locking claw is detached from the locking teeth is applied, and the locking claw swings around the contact point (b) of the ratchet pole and the release rod so that the locking claw has a tip of the locking teeth. Since the ratchet pole is detached from the ratchet plate before the pulling force from the fulcrum pin is transmitted to the ratchet plate by sliding in the direction, it is possible to prevent a half-hanging state per tooth tip. At this time, since the ratchet pole is configured to be movable relative to the release rod, the latching pawl of the ratchet pole can slide without trouble in the direction of the tip of the latching tooth of the ratchet plate. In this case, the occupant is prompted to perform the operation again.

Further, when the contact point (b), the center of the locking tooth arc (O1) and the center of the locking pawl arc (O2) are in a straight line, the locking pawl of the ratchet pole is moved to the ratchet plate. When it comes into contact with the locking teeth (on the first area of the embodiment), if the pulling force of the parking brake lever is released, the force to lower the release rod is transmitted to the ratchet pole as described above. The load from the rod is a force that is collinear with the direction of the reaction force from the ratchet plate. At this time, the brake cable tension is stronger than the force pushing the release rod (push button) that acts on the release rod. While the rod (push button) is slightly returned, the ratchet pole operates for the clearance. In other words, the contact point (a) of the fulcrum pin and the ratchet pole changes due to the relative movement of the fulcrum pin and the ratchet pole due to the clearance, and the direction in which the load acts is changed between the contact point of the ratchet pole and the release rod and the locking tooth. From the direction of the load (F1) when the tooth tips come into contact with each other when there is a straight line connecting the center of the arc and the center of the arc of the locking claw, the contact point of the fulcrum pin and ratchet pole and the locking tooth When there is a straight line connecting the center of the arc of the hook and the center of the arc of the locking claw, the direction of the load changes when the tooth tips come into contact with each other (F2). When the disengaging force acting on the ratchet pole is extinguished, the ratchet pole swings in the direction in which the latching claw engages with the latching teeth of the ratchet plate. Engaged with by the locking teeth and the locking pawl can be completely fitted.

According to the second feature of the present invention, the first balanced state or the second balanced state is a contact point between the locking tooth and the locking claw (due to friction between the locking tooth and the locking claw). c) each occurs in a predetermined region, but the region where the first balanced state (S1) and the region where the second balanced state occurs (S2) do not overlap, and thus are included in both regions. Since there is no contact (c) between the locking tooth and the locking claw, the sliding claw according to claim 1 is surely slid in the tooth tip direction or sliding in the engagement direction. The half-hanging state can be prevented.

FIG. 1 is a view showing a state where the parking brake lever is pulled up to the operating position by a normal operation. (First embodiment) FIG. 2 is an enlarged view of a main part of FIG. (First embodiment) FIG. 3 is a view showing a state where the parking brake lever is pulled up to the operating position while pushing the push button. (First embodiment) 4 is an enlarged view of a main part of FIG. (First embodiment) FIG. 5 is an explanatory view of the action in which the balanced state is canceled when the parking brake lever is pulled up to the operating position while pushing the push button. (First embodiment) FIG. 6 is an explanatory view of the operation when half hooking per tooth tip occurs. (First embodiment) FIG. 7 is an explanatory view (No. 1) of the operation when a balanced state does not occur when the parking brake lever is pulled up to the operating position while pushing the push button. (First embodiment) FIG. 8 is an explanatory view (No. 2) of the action in a balanced state when the parking brake lever is pulled up to the operating position while pushing the push button. (First embodiment)

11 Bracket (car body)
13 Parking brake lever 14 Brake cable 17 Ratchet plate

17a Locking tooth

17b Locking groove 18 Support point pin 19 Ratchet pole 19c Locking claw 23 Release rod

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First embodiment

1 to 8 show an embodiment of the present invention.

As shown in FIGS. 1 and 2, a parking brake device provided in a vehicle interior of a vehicle includes a parking brake lever 13 pivotally supported by a bracket 11 fixed to the vehicle body via a support shaft 12. . The parking brake lever 13 includes a base portion 13a that is pivotally supported by the support shaft 12, and a grip portion 13b that extends forward and upward from the base portion. One end of the brake cable 14 is coupled to the base portion 13a, and the grip portion 13b A push button 15 is provided at the tip. When the guide pin 16 fixed to the base portion 13a is engaged with the long hole 11a formed in an arc shape centering on the support shaft 12, the swingable range of the parking brake lever 13 is restricted.

The arcuate ratchet plate 17 in which a plurality of locking teeth 17a ... and locking grooves 17b ... are alternately formed around the support shaft 12 is fixed to the bracket 11 (see FIG. 2). A support hole 19a of a ratchet pole 19 is pivotally supported by a fulcrum pin 18 fixed to the base 13a of the parking brake lever 13 with a slight clearance. An intermediate portion of a torsion spring 21 is supported by a boss portion 20 provided on a base portion 13a of the parking brake lever 13, and one end of the torsion spring 21 is locked to one end of a release rod 23 described later, and the other end. Is latched to a spring engaging portion 19 b at one end of the ratchet pole 19. The ratchet pole 19 is biased counterclockwise in FIG. 1 by the elastic force of the torsion spring 21, and the locking claw 19 c provided at the other end is engaged with the locking groove 17 b of the ratchet plate 17. Be energized.

A release rod 23 is disposed inside the grip portion 13 b of the parking brake lever 13, and a long hole 23 a formed in an intermediate portion thereof is slidably engaged with a guide pin 24 provided on the parking brake lever 13. One end of the release rod 23 is connected to the push button 15, and a pressing surface 23 b formed in an arc shape at the other end can abut against a flat pressed surface 19 d of the ratchet pole 19. Accordingly, when the occupant presses the push button 15, the release rod 23 guided through the long hole 23a by the guide pin 24 moves, and the pressing surface 23b presses the pressed surface 19d, so that the ratchet pole 19 is twisted. The latching claw 19c swings in a clockwise direction against the elastic force of the spring 21, that is, in a direction in which the latching claw 19c is detached from the latching groove 17b of the ratchet plate 17.

In a state where the teeth of the locking teeth 17a and the locking claws 19c are in contact with each other, the contact point b of the ratchet pole 19 and the release rod 23, the center O1 of the arc of the locking teeth 17a, and the locking claws 19c The direction of the first straight line when the center O2 of the arc exists on a straight line (see the force line F1 in FIG. 5A) and the tooth tips of the locking tooth 17a and the locking claw 19c contact each other. The second straight line when the contact point a of the fulcrum pin 18 and the ratchet pole 19, the arc center O1 of the locking tooth 17a, and the arc center O2 of the locking claw 19c are in a straight line. The direction (see the force line F2 in FIG. 6) is set differently.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

In FIG. 1, when the occupant pulls up the parking brake lever 13 in the direction of arrow A to operate the parking brake, the ratchet pole 19 supported by the parking brake lever 13 moves upward along the ratchet plate 17 fixed to the bracket 11. Moving. At this time, the ratchet pole 19 is urged by the torsion spring 21 in a direction in which the locking claw 19c abuts the locking teeth 17a ... and the locking grooves 17b of the ratchet plate 17, so that the locking claw The ratchet pole 19 moves upward while 19c ticks over the locking teeth 17a of the ratchet plate 17 one by one. At this time, since the occupant has not pushed the push button 15 of the parking brake lever 13, the pressing surface 23 b of the release rod 26 is slightly separated from the pressed surface 19 d of the ratchet pole 19, and the release rod 23 rotates around the fulcrum pin 18. The swinging of the ratchet pole 19 is not hindered.

When the parking brake lever 13 is pulled up, the brake cable 14 is pulled, and when the load is sufficiently increased, the parking brake lever 13 is released by the tension of the brake cable 14 when the lifting force of the parking brake lever 13 is released. The parking brake lever 13 is held in the operating position when the locking claw 19c of the ratchet pole 19 is engaged with one of the locking grooves 17b of the ratchet plate 17. At this time, the parking cable is activated by the brake cable 14 and the parking brake lever 13 is pulled in the direction of arrow B by the tension of the brake cable 14, but the locking claw 19 c of the ratchet pole 19 is locked to the locking groove 17 b of the ratchet plate 17. The parking brake lever 13 is never pulled back.

The elastic force of the torsion spring 21 is negligibly small compared to the tension of the brake cable 14, and the release rod 23 is separated from the ratchet pole 19, so that the load acting on the ratchet pole 19 is Only the load transmitted from the fulcrum pin 18 of the parking brake lever 13 urged in the pulling-down direction (arrow B direction) by the tension of 14 is applied to the locking claw 19c of the ratchet pole 19 and the locking groove 17b of the ratchet plate 17. The load force line F2 acting on the engaging portion passes through the support hole 19a and the contact point a of the fulcrum pin 18 (see FIG. 2).

When the occupant presses the push button 15 to release the parking brake, the release rod 23 guided by the long hole 23a is moved by the guide pin 24, and the pressing surface 23b presses the pressed surface 19d of the ratchet pole 19. Thus, the ratchet pole 19 swings around the fulcrum pin 18 in the direction of the arrow C in FIG. 2 against the elastic force of the torsion spring 21, and the locking claw 19 c extends from the locking groove 17 b of the ratchet plate 17. break away. As a result, the parking brake lever 13 swings in the direction of arrow B due to the tension of the brake cable 14 and is returned to the inoperative position.

Now, if the occupant should pull up the parking brake lever 13 without pressing the push button 15, the parking brake lever 13 may be pulled up while pushing the push button 15 slightly. At this time, as shown in FIGS. 3 and 4, since the push button 15 is pressed, the pressed surface 19d is pressed by the pressing surface 23b of the release rod 23, and the ratchet pole 19 swings in the direction of arrow C. Then, the parking brake lever 13 is pulled up to the operating position while the locking claw 19c intermittently contacts the teeth of the locking teeth 17a of the ratchet plate 17.

In a state where the pulling force of the parking brake lever 13 by the occupant is substantially balanced with the tension of the brake cable 14 in the operating position, the tips of the locking teeth 17a and the locking claws 19c are released without releasing the finger from the push button 15. May contact the vicinity of the tip of the latching claw 19c of the ratchet pole 19 with the vicinity of the tip of the latching tooth 17a of the ratchet plate 17 in a balanced state (see FIG. 4).

FIG. 5A shows an enlarged view of the engaging portions of the locking claw 19c and the locking teeth 17a at this time. The distal end of the locking claw 19c and the distal end of the locking tooth 17a are both arcs, and the release rod is in a state where the pulling force of the parking brake lever 13 by the occupant is substantially balanced with the tension of the brake cable 14. The force line F1, which is the direction of the load generated by pressing the ratchet pole 19 to the ratchet pole 19, is the arc center O1 of the locking claw 19c, the arc center O2 of the locking tooth 17a, the release rod 23 and the ratchet pole 19 A balanced state occurs when passing through the contact point b. When the coefficient of friction between the locking claw 19c and the locking tooth 17a is 0, the point at which the locking claw 19c and the locking tooth 17a are engaged in a balanced state is only one point c. Since there is a coefficient of friction of about 0.1 between the locking claw 19c and the locking tooth 17a, the locking claw 19c and the locking tooth 17a have a fan-shaped second shape with a central angle of about 12 ° with the point c as the center. It can be engaged in a balanced state in one region S1.

That is, the pulling force of the parking brake lever 13 by the occupant is substantially balanced with the tension of the brake cable 14, and the locking claw 19c and the locking teeth 17a are in a balanced state while the occupant is pushing the push button 15 slightly. Engaging is performed only when the locking claw 19c is in contact with the first region S1 of the locking tooth 17a.

Here, consider the second region S2 in which half hooking per tooth tip occurs. As shown in FIG. 6, a state in which the occupant has released the push-up force of the parking brake lever 13 while pushing the push button 15 slightly, that is, a state in which the tension of the brake cable 14 has lowered the parking brake lever 13. Then, the force by which the pressing surface 23b of the release rod 23 presses the pressed surface 19d of the ratchet pole 19 can be ignored. That is, the locking claw 19 c and the locking teeth 17 a are engaged by the tension of the brake cable 14. Here, the force line F2 generated by the ratchet pole 19 through the fulcrum pin 18 due to the tension of the brake cable 14 includes the arc center O1 of the locking claw 19c, the arc center O2 of the locking tooth 17a, and the fulcrum pin. A half-hanging state occurs when passing through contact point a (see FIG. 6) of 18 and ratchet pole 19. Even if the occupant releases the push button 15 slightly in this state, the parking brake lever 13 is already pulled down by the tension of the brake cable 14, so the direction of the force line F2 does not change. Instead, the half-hanging state is maintained. Due to the displacement in the direction between the force line F1 and the force line F2, the second region S2 is displaced in the tooth tip direction of the locking tooth 17a from the first region S1.

Here, the latching claw 19c and the latching tooth 17a are engaged in a half-hanging state per tooth tip when the latching claw 19c is in contact with and held in the second region S2 of the latching tooth 17a. However, in the present invention, the locking claw 19c can slide with respect to the locking teeth 17a and can be securely engaged with the locking grooves 17b without being in such a state as will be described later. .

Next, the operation when the occupant pulls up the parking brake lever 13 while pressing the push button 15, stops the pulling, and then releases the push button 15 will be described.

When the occupant pulls up the parking brake lever 13 while pushing the push button 15 slightly, the locking claw 19c intermittently contacts the teeth of the locking teeth 17a of the ratchet plate 17, while the parking brake lever 13 is in the operating position. Be raised. Here, as shown in FIG. 5A, without releasing the finger from the push button 15 in a state where the pulling force of the parking brake lever 13 by the occupant is substantially balanced with the tension of the brake cable 14 in the operating position, When the locking claw 19c happens to abut on the first region S1 of the locking tooth 17a when b and the arc center O1 of the locking tooth 17a and the arc center O2 of the locking claw 19c are in a straight line. The locking claw 19c and the locking teeth 17a are engaged in a balanced state.

Thereafter, when the occupant weakens the pulling force of the parking brake lever 13 without releasing his / her finger from the push button 15, the tension of the brake cable 14 biases the fulcrum pin 18 and the release rod 23 downward. The support hole 19a and the fulcrum of the ratchet pole 19 and a slight clearance of the ratchet pole are formed, and since the tension of the brake cable 14 is stronger than the force of pushing the push button 15 to act the release rod 23, the push button 15 The ratchet pole 19 is pushed up relatively in the ratchet circumferential direction from the ratchet plate 17 by the clearance, while being slightly returned. As a result, the support hole 19a of the ratchet pole 19 and the fulcrum pin 18 come into contact with point a (see FIG. 2), and the force line F2 generated when the parking brake lever 13 is pulled down by the tension of the brake cable 14 rises. The balance area changes from the first area S1 to the second area S2. At this time, when the restriction of the counterclockwise rotation of the ratchet pole 19 is released by releasing the push button 15, the locking claw 19c was originally located in the region S1, and therefore the balance line F2 is in a balanced state. Instead, the locking claw 19c slides in the meshing direction.

Further, as shown in FIG. 7A, the locking claw 19c is not released without releasing the finger from the push button 15 in a state where the pulling force of the parking brake lever 13 by the occupant is substantially balanced with the tension of the brake cable 14. In the case of contact at, for example, point c on the tooth tip side of the locking tooth 17a with respect to the first region S1, the occupant then releases the pulling force of the parking brake lever 13 with the push button 15 slightly pushed. In this case, as the tension of the brake cable 14 pulls down the parking brake lever 13, the fulcrum pin 18 and the release rod 23 are pulled down.

At this time, the force in the direction in which the fulcrum pin 18 is lowered by the clearance between the fulcrum pin 18 and the ratchet pole 19 is not transmitted to the ratchet pole 19 until the fulcrum pin 18 is moved by the clearance, and the force in which the release rod 23 is lowered is the ratchet pole 19. It is transmitted to. This force is transmitted to the ratchet plate 17 via the ratchet pawl 19. At this time, the latching claw 19 c is in contact with the position closer to the tooth tip than the first region S 1 of the latching tooth 17 a. The reaction force on the ratchet pole 19 is divided, and a force is applied in a direction in which the locking claw 19c is disengaged from the locking teeth 17a, and the pressing surface 23b of the release rod 23 and the pressed surface 23b of the ratchet pole 19 are connected. The ratchet pole 19 swings in the clockwise direction of FIG. 4 with the abutting point b as a fulcrum, and the pulling force from the fulcrum pin 18 is transmitted to the ratchet plate 17 as shown in FIG. Since the locking claw 19c slides in the direction of the tip of the locking tooth 17a before it occurs, the locking claw 19c of the ratchet pole 19 is released. Returned by the tension of the rake cable 14, it is possible to prompt re-operation is recognized that the lock of the parking brake lever 13 is deviated occupant.

At this time, assuming that the pressing surface 23b of the release rod 23 and the pressed surface 19d of the ratchet pole 19 cannot slide relative to each other, that is, a recess provided in one of the pressing surface 23b and the pressed surface 19d and the other provided in the other. Assuming that the projection is engaged, the locking claw 19c cannot slide with respect to the locking tooth 17a as shown in FIG. 7B, but in this embodiment, the release rod 23 is pressed. Since the relative movement between the surface 23b and the pressed surface 19d of the ratchet pole 19 is not restricted, the ratchet pole 19 freely swings, and the locking claw 19c freely slides with respect to the locking teeth 17a. Engagement can be reliably released.

Further, as shown in FIG. 8A, after the parking brake lever 13 is lifted while the push button 15 is slightly pressed, the locking claw 19c is located on the tooth side of the locking tooth 17a from the first region S1. In the case of contact at a point, the locking claw 19c and the locking tooth 17a cannot be engaged in a balanced state, and the ratchet pole 19 by the release rod 23 is released by releasing the push button 15 in the same manner as in the operation of FIG. As shown in FIG. 8 (B), the locking claw 19c slides in the tooth base direction of the locking tooth 17a, so that the locking claw 19c and the locking tooth 17a are completely engaged and parked. The operation of the brake lever 13 is completed normally.

As illustrated in FIG. 5A, when the locking claw 19c and the locking tooth 17a are engaged in a balanced state at the point c of the first region S1, the occupant releases the parking brake lever 13 from that state. Then, the load for the fulcrum pin 18 to press the support hole 19a of the ratchet pole 19 by the tension of the brake cable 14 becomes larger than the load for the pressing surface 23b of the release rod 23 to press the pressed surface 19d of the ratchet pole 19. As shown in FIG. 5 (B), the line of force changes from F1 to F2.

As described with reference to FIG. 6, the force line F <b> 2 indicates that when the parking brake lever 13 is pulled down by the tension of the brake cable 14, even if the occupant does not push the push button 15, Although it is a line of force when the stationary tooth 17a is engaged in a half-hanging state per tooth tip in the second region S2, as described above, the locking claw 19c and the locking tooth 17a are actually in a balanced state in the first region S1. In order to maintain the engagement in the balanced state in the first region S1, a load in the direction of the line of force F1 is necessary, but the occupant has released the parking brake lever 13. Since the line of force moves from F1 to S2 (see FIG. 5B), when the push button 15 is released here, the balanced engagement in the first region S1 is not maintained, and the locking claw 19 Fully engage the locking groove 17b slipped locking teeth 17a on the tooth present side, the operation of the parking brake is completed normally (see FIG. 5 (C)).

As described above, even if the occupant pulls up the parking brake lever 13 while pushing the push button 15 slightly and a balanced state occurs, the force line is changed from the first force line F1 to the first force line F1 when the tension of the brake cable 14 mainly works. When the occupant finally releases his / her finger from the push button 15 in the first area S1, the half-hanging state per tooth tip is reliably eliminated, When contact is made on the tooth tip side with respect to the first region S1, re-operation can be urged by disengaging the locking claw 19c from the locking tooth 17a before the region where the balance in the second region S2 occurs is changed. Therefore, the parking brake lever 13 does not end in a half-hanging state per tooth tip.

Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

For example, in the embodiment, the pressing surface 23b of the release rod 23 is an arc surface, and the pressed surface 19d of the ratchet pole 19 is a flat surface, so that the release rod 23 and the ratchet pole 19 can be relatively moved. When the release rod 23 and the ratchet pole 19 are engaged with the concave and convex portions, it is necessary to have a predetermined backlash so that they can move relative to each other and eliminate half-hanging per tooth tip. Accordingly, unnecessary swinging of the ratchet pole 19 can be restricted.

However, even when the concave and convex engaging portions of the release rod 23 and the ratchet pole 19 are given backlash, in order to keep the position of the ratchet pole 19 relative to the release rod 23 constant, the ratchet pole 19 is held by the spring with the release rod 23. Need to be energized against.

Claims

A parking brake lever (13) pivotably supported by the vehicle body (11) and pulled up to pull the brake cable (14);
A ratchet pole (19) pivotally supported by the parking brake lever (13) via a fulcrum pin (18);
A ratchet plate (17) fixed to the vehicle body, provided alternately with a plurality of locking teeth (17a) and locking grooves (17b) with which the locking claws (19c) of the ratchet pole (19) can be engaged;
A release that swings the ratchet pole (19) in a direction to disengage the locking claw (19c) from the locking groove (17b) by pressing the ratchet pole (19) by a release operation of the occupant A rod (23);
A parking brake device comprising:
A predetermined clearance is provided between the ratchet pole (19) and the fulcrum pin (18),
The contact point (b) of the ratchet pole (19) and the release rod (23) in the state where the tooth tips of the locking tooth (17a) and the locking claw (19c) are in contact with each other, and the engagement With respect to the direction of the first straight line when the center (O1) of the arc of the detent (17a) and the center (O2) of the arc of the locking claw (19c) are in a straight line,
The contact point (a) of the fulcrum pin (18) and the ratchet pole (19) in the state where the tooth tips of the locking tooth (17a) and the locking claw (19c) are in contact with each other, and the engagement The center (O1) of the arc of the pawl (17a) and the center (O2) of the arc of the locking claw (19c) are provided so that the directions of the second straight line are different from each other.
The parking brake device according to claim 1, wherein the ratchet pole (19) is movable relative to the release rod (23).
When the pulling force of the occupant of the parking brake lever (13) and the tension of the brake cable (14) are substantially equal, the engagement force is applied by the pressing force of the release rod (23) against the ratchet pole (19). When the teeth of the pawl (17a) and the locking claw (19c) are in contact with each other and the first straight line exists in this state, the first balance state is established, and the parking brake lever (13) When the occupant's lifting force is substantially zero, the tips of the locking teeth (17a) and the locking claws (19c) come into contact with each other due to the tension of the brake cable (14). If there are two straight lines, the second balance state is established.
In the first balanced state and the second balanced state, the balanced state when the first straight line exists and the balanced state when the second straight line exists respectively occur. It occurs within a predetermined region (S1, S2) centering on the contact point (c) of the stop tooth (17a) and the locking claw (19c),
The parking brake device according to claim 1, wherein the region (S1) where the first balance state occurs and the region (S2) where the second balance state occurs do not overlap each other.